What physical state should smoke detectors be in to work effectively?

For smoke detectors to function effectively, they must be free from dust and not expired. Dust accumulation can obstruct the sensor's ability to detect smoke particles accurately, leading to potential false alarms or failure to alert occupants to a fire. Additionally, smoke detectors have a limited lifespan; most should be replaced every ten years. An expired detector may not respond properly to smoke, compromising the safety of the environment it is meant to protect. Therefore, regular cleaning and timely replacement are essential for ensuring reliable operation.

In contrast, painting over smoke detectors can interfere with their functionality by blocking airflow and potentially obscuring the sensors. Placing them near cooking appliances could lead to frequent false alarms due to cooking smoke, distracting from genuine alerts. Covering smoke detectors with furniture could prevent them from sensing smoke altogether, making them ineffective in an emergency.